feat: migrate from Cedar to SpiceDB authorization system

This is a major architectural change that replaces the Cedar policy-based
authorization system with SpiceDB's relation-based authorization.

Key changes:

- Migrate from Rust to Go implementation
- Replace Cedar policies with SpiceDB schema and relationships
- Switch from envoy `ext_authz` with Cedar to SpiceDB permission checks
- Update build system and dependencies for Go ecosystem
- Maintain Envoy integration for external authorization

This change enables more flexible permission modeling through SpiceDB's
Google Zanzibar inspired relation-based system, supporting complex
hierarchical permissions that were difficult to express in Cedar.

Breaking change: Existing Cedar policies and Rust-based configuration
will no longer work and need to be migrated to SpiceDB schema.

1 files changed, 0 insertions, 70 deletions

diff --git a/vendor/fixedbitset/src/block/default.rs b/vendor/fixedbitset/src/block/default.rs
deleted file mode 100644
index 7fc460fb..00000000
--- a/vendor/fixedbitset/src/block/default.rs
+++ /dev/null
@@ -1,70 +0,0 @@
-use core::ops::{BitAnd, BitAndAssign, BitOr, BitOrAssign, BitXor, BitXorAssign, Not};
-
-#[derive(Copy, Clone, PartialEq, Debug)]
-#[repr(transparent)]
-pub struct Block(pub(super) usize);
-
-impl Block {
-    #[inline]
-    pub const fn is_empty(self) -> bool {
-        self.0 == Self::NONE.0
-    }
-
-    #[inline]
-    pub fn andnot(self, other: Self) -> Self {
-        Self(!other.0 & self.0)
-    }
-}
-
-impl Not for Block {
-    type Output = Block;
-    #[inline]
-    fn not(self) -> Self::Output {
-        Self(self.0.not())
-    }
-}
-
-impl BitAnd for Block {
-    type Output = Block;
-    #[inline]
-    fn bitand(self, other: Self) -> Self::Output {
-        Self(self.0.bitand(other.0))
-    }
-}
-
-impl BitAndAssign for Block {
-    #[inline]
-    fn bitand_assign(&mut self, other: Self) {
-        self.0.bitand_assign(other.0);
-    }
-}
-
-impl BitOr for Block {
-    type Output = Block;
-    #[inline]
-    fn bitor(self, other: Self) -> Self::Output {
-        Self(self.0.bitor(other.0))
-    }
-}
-
-impl BitOrAssign for Block {
-    #[inline]
-    fn bitor_assign(&mut self, other: Self) {
-        self.0.bitor_assign(other.0)
-    }
-}
-
-impl BitXor for Block {
-    type Output = Block;
-    #[inline]
-    fn bitxor(self, other: Self) -> Self::Output {
-        Self(self.0.bitxor(other.0))
-    }
-}
-
-impl BitXorAssign for Block {
-    #[inline]
-    fn bitxor_assign(&mut self, other: Self) {
-        self.0.bitxor_assign(other.0)
-    }
-}